Performance analysis of dual-hop UAV relaying systems over mixed fluctuating two-ray and Nakagami-m fading channels

School of Electronics and Information Engineering, Beijing Jiaotong University, Beijing 100044, China; The State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China; Department of Informatics and Telecommunications, University of Peloponnese, Tripoli 22131, Greece; State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China